I wasn't able to get it on DirecTV last night either. The game was blacked out in my area. Which is funny, because I don't live in Portland, and though we share RootNW, it wasn't showing the game for Portland either.
They did mention that if the game is not sold out within 72 hours (DirecTV rep) that the NBA will sometimes black them out. Sounded like the game was a sell-out, though.